Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6037b3d0b1074ea…

MALICIOUS

PDF

45.5 KB Created: 2020-09-01 11:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37dd211d4f29fd9f1569b91fcc8aefee SHA-1: 411306b138f9a589776f63d95113bac51060a71b SHA-256: c6037b3d0b1074ea6e25cb0921eb52b51dc0eee51cd898de2ed9f3b469eb8bf9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=vim+commands+mac+cheat+sheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The presence of these indicators suggests the document is designed to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=vim+commands+mac+cheat+sheet
    • https://cdn.shopify.com/s/files/1/0436/4913/8846/files/display_scaling_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/7160/9761/files/38805176819.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/real_fingerprint_lock_screen.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/everquest_classic_alchemy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/being_alive_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_21cd1a1bc45d4a549ae9719109255894.pdf
    • https://static.usrfiles.com/ugd/c8a981_6f7660397c5441e49b5df86d04a29301.pdf
    • https://cdn.shopify.com/s/files/1/0462/5645/5831/files/burgundy_long_sleeve_formal_dresses.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/sugefe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/clinician_administered_ptsd_scale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681e.bin
8e8d3f6ad53ce62c930eb3f7aa812b4c93ca75eff801cf70b74394ef4e673b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681E 5016 bytes
font_01_sfnt_off0000790e.bin
7f72a11507ff02455af742bf73b47095c329f9a8994490b9e6b9c81b21ddb7ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790E 15520 bytes

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